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Author Topic: After run oil in cowled engines  (Read 1464 times)

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Offline Geoff Sleath

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After run oil in cowled engines
« on: March 02, 2013, 15:58:56 PM »
I've been running in my new SC91FS mounted in the Hanger 9 P47.  I've put 2 large tanks-full of Weston Liquid Gold 100% synthetic 5% nitro fuel through it very rich, mostly on full throttle occasionally leaning it out a little and allowing time cool between shortish runs.  I'm using a 13x8 prop mainly because I happen to have a couple in stock.  Do you think it would be OK to fly provided I don't lean it out too much?  I bought the engine S/H but BNIB.

I always put after-run oil in my engines after a day's flying.  That's easy when the cowl is off but impossible with cowl fitted because I can't access either the carb intake or the crankcase breather.  What do people do?  Not bother with after run (contrary to the engine instructions)?  Remove the cowl to gain access before putting the model away?

I've been flying mostly electric this past year.  Isn't glow a lot of messy faff?  I'm almost regretting I didn't fit an electric motor :)

Geoff


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Re: After run oil in cowled engines
« Reply #1 on: March 02, 2013, 16:33:12 PM »
Geoff

I have a SC91FS in my Aeromaster and that is cowled, I have never used after run oil and I have had it for about two years without issue. My last Aeromaster had an OS91FS in it and I flew it foe four years, again never used after run oil.
The same aplies to the OS120FS I had in my Blackhorse Ultimate over four years without after run.
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Offline tomkfly

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Re: After run oil in cowled engines
« Reply #2 on: March 02, 2013, 17:12:54 PM »
No need to use after run, especially as you are using Weston fuel.

Tom
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Offline Geoff Sleath

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Re: After run oil in cowled engines
« Reply #3 on: March 02, 2013, 18:59:47 PM »
Thanks, gentlemen.  I wasn't looking forward to taking the cowl off every time I flew the P47.  Not that it's very difficult (just remove the prop and four 4mm button head allen screws) but it's a pain to do regularly.

Geoff

Offline Saxon

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Re: After run oil in cowled engines
« Reply #4 on: March 02, 2013, 19:38:28 PM »
I always thought good quality after run oil was a must at the end of a flying session regardless of the type of (glow) fuel used.

Is it a four stroke thing??

Surely the engine should at least be "treated" if it is going to be layed up for example at the end of the season.

John
« Last Edit: March 02, 2013, 19:40:17 PM by Saxon »


Offline Mike_T

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Re: After run oil in cowled engines
« Reply #5 on: March 02, 2013, 21:03:05 PM »
After run oil is better described as 'lay-up' oil.  If you are using an engine regularly, I wouldn't (and don't) bother. 

FWIW none of the engines I 'laid-up' before the advent of after-run oils has suffered any ill-effects.

Offline tomkfly

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Re: After run oil in cowled engines
« Reply #6 on: March 03, 2013, 01:30:24 AM »
Fuchs put additives in Aerosave, which prevent corrosion. However, they recomend you stop the engine whilst it is running fast, cutting off the fuel supply by pinching or removing the fuel tube. For laying up for periods of over 6 months they say use  a small amount of neat Aerosave.
I belive It is  Aerosave that Weston use in their fuels.
Tom
« Last Edit: March 03, 2013, 01:31:55 AM by tomkfly »
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